Portable bucking tool



Patented Aug. 15, 1950 UNITED STATES PATENT OFFICE PORTABLE BUCKING TOOLMorris Brown, San Diego, Calif. Application March 9, 1945, Serial No.581,863 2 Claims. (Cl. 1S-53.5)

The invention relates to portable bucking tools for riveting through apower hammer which imparts blows to rivets engaging the tool.

The several objects of the invention are to provide a bucking tool:which is light in weight to reduce fatigue of the operator and adaptedfor bucking heavy rivets; which comprises an elastic casing whichfunctions to deaden sound and reduce the shock transmitted to theoperator; in which the elastic casing also functions to damp the hammerimparted strokes to the bucking-head; for increasing the reactivestrokes imparted to the head by the spring pressed anvil; which includesa simple and quickly detachable connection between the stem of thebucking-head and tube in which it is slidable for attachingbucking-heads of diiierent shapes for use in different types of rivetingor for rivets of different shapes and sizes; and other objects whichwill appear from the detail description.

The invention consists in the several novel features which arehereinafter set forth and more particularly defined by claims at theconclusion hereof.

In the drawings:

Fig. 1 is a longitudinal section of a tool embodying the invention,parts being shown in elevation.

Fig. 2 is a section taken on line 2-2 of Fig. l.

Fig. 3 is a perspective of a bucking-head.

Fig. 4 is a detail perspective of the tube in which the stem of thebucking-head is slidable and in which the anvil is conned.

Fig. 5 is a longitudinal section of a modified form of the invention,parts being shown in elevation.

Fig. 6 is a perspective of the shown in Fig. 5.

Fig. '1 is a perspective of the tube shown in Fig. 5. a

Fig. 8 is a section taken on line 8--8 of Fig. 5.

The invention is exemplified in a bucking tool which comprises a metaltube I0, the bore of which is cylindrical; a bucking-head II providedwith a cylindrical stem I2 which lits into, is slidable in one endportion of the tube IIJ; and is provided with a longitudinally extendinggroove; an instruck resilient tongue I5 on the tube III which is adaptedto extend and fit into the groove I4 in the stem and slidably retain thehead I I in connected relation, and against rotation relatively, tg thetube I0; cylindrical anvil I6 slidably iitting in the tube I0; a springI1 acting on the anvil I6 to impart counter-blows to the head IIreactively to the impact blows from the hamretaining member gaged byspring I1.

mer; and a casing I9 formed of elastic material, such as rubber whichfits snugly around the outer periphery of tube I0 and is provided with aclosed end 20 lthe inner face of which is en- The tongue I5 and grooveI4 are shaped to permit the stem I2 to be inserted into the tube I0, sothe tongue will snap into groove I4 and predeterminedly limit theoutward movement of the anvil I6 by its spring I1, when the stem I2 iswithdrawn from tube I0, and to adapt the stem I2 to be slidable inwardlyfrom the impact blows derived from the hammer through the rivets. Thetongue I5 fits in and extends across the groove I4 so the tube and stemwill be relatively non-rotatable. This exempliiies a simple constructionfor quickly and interchangeably connecting bucking-heads of differentshapes which are adapted for different forms of riveting or rivetingrivets of different shapes and sizes. The tongue I5 normally arrests theoutward movement of the stem I2 by the springpressed anvil IB, thespring I1 being under compression when the bucking head Il is connectedto the tube I0. The tongue is also adapted to be cammed out of grooveI4, when preponderating force is applied to the head for its removalfrom the tube, and the inner end of the stem is adapted to spring thetongue outwardly when the stem is forced into the tube. This exemplifiesa snapconnection for easily and quickly and interchangeably connectingbucking-heads for different kinds of work, to the tube containing thespring-pressed anvil.

The tube I0 terminates inwardly from the end of the elastic casing I9adjacent the head II and a washer 22 of metal surrounds stem I2 betweensaid end of casing I9 and a shoulder 23 on the head II. The impact blowsimparted from the hammer through the rivets to the head II, cause theshoulder 23 to engage the washer 22 and the latter to engage thecontiguous end of the elastic casing I9. This damps the inward movementof the head I I resulting from the impact blows imparted to the head,and causes the spring-pressed anvil to rebound from, and impart'moreeffective counter-blows to the stem l2 on head I I. This accelerates theupsetting of the rivets and effects a saving of time in rivetingoperations. The masses in the head and in the anvil, and the force ofspring I1 are co-related so as to tend to synchronize the hammer blowsand the counter-blows.

The elastic casing I9 which is gripped by the operator in bucking therivets, suppresses or deadens the noise or sound resulting from theimpact and counter-blows and also cushions these blows, to lessenfatigue and shock in the use of the tool. The casing I9 may have itsouter periphery annularly gooved, as at 24, for rm gripping in the handsof the user.

The operation of the bucking tool is as follows: the user will insertinto the open end of tube In the stem I2 of a bucking tool having a faceshaped for the particular class of riveting desired, the tongue I5 willsnap into groove I4 and slida-bly and non-rotatably hold the head II inoperative relation with the tube I and-casing I9. This constructiongreatly facilitates interchange of heads for different classes ofriveting. The operator, gripping the casing I9, Will hold the outer faceof head II against a rivet which has been inserted through the Work tobe riveted. Hammer blows Will be imparted to the rivet by anotheroperator, which will be transmitted through the rivets to the head I I,for upsetting the inner end of the rivets. These blows will betransmitted by the head I I to the anvil I6, causing the latter torebound from the stem I2 against the force of spring I'I. The springwill cause the anvil to reactively impart Outward blows to the head.During the inward strokes of the head, shoulder 23 will engage washer22, which will compress the inner end of elastic casing I9 to ldamp thevibrations of the head, for rendering the counter-blows on the stem fromthe anvil more effective and for accelerating the riveting operations.During these riveting operations the noise produced will be deadened orsuppressed by the elastic casing which will also reduce transmission ofthe vibrations in the tube IIJ resulting from the impact andcounterblows. This greatly reduces fatigue of the operator.

In the modication of the invention illustrated in Figs. 5 to 8, the tubeI0', is provided with a longitudinal slot 26, the stem I2 of thebuckinghead II is provided with a groove I4', and a retaining member 2'Iextends through slot 26 into and yieldingly held in groove I 4 by theelastic casing I9', and is provided with abutments 28 which engage thetube I0 at the ends of slot 26 for retaining the member' 21 in the tubewhen the stem I2 is withdrawn from the tube. This exemplifies a snapconnection for the tube and stem in which the retaining member isyieldingly held in the stem by the elastic casing. A cap 30 is securedby a pin 3l in the outer end of tube I0', and functions as a closure forsaid end of the tube and as an abutment for the spring I1 which pressesagainst the anvil I6. The outer end of the elastic casing I9' terminatesat the cap 30. The inner end of the casing I9' extends beyond the innerend of the tube I0' for the purpose before described. The operation ofthis modified form of the invention is similar to the operation of theother construction.

The invention exemplies a portable bucking tool which comprises anelastic casing which reduces the fatigue of the operator; is light inweight; is adapted for comparatively heavy work; accelerates theriveting operations; a snap connection between the tube and thebuckinghead which permits easy and quick interchange of heads fordiierent kinds of work; reduces the 4 noise incident to the rivetingoperations; and is simple in construction and e'cient in operation.

The invention is not to be understood as restricted t0 the details setforth since these may be modified within the scope of the appendedclaims without departing from the spirit and scope of the invention.

Having thus described the invention. what I claim as new and desire tosecure by Letters Patent is:

1. A portable bucking tool for co-acting with a power-hammer,comprising: a tubular member open at its inner end, a bucking headprovided with a face for engaging a rivet and receiving impact blowsfrom the hammer to the rivet, and with a stem slidably mounted in thetubular member, an anvil for the stem confined in the tubular member, aspring at the inner end of the tubular member acting on said anvil,means for slidably retaining the stem in the tubular member, and atubular casing of sound-deadening material around and jacketing thetubular member substantially throughout its entire length, forming asupporting grip for manipulating the tool and having an integralend-portion forming a seat for said spring.

2. A portable bucking tool for co-acting with a power-hammer, comprisinga tubular member, a bucking head provided with `a face for engaging a.rivet and receiving impact blows from the hammer to the rivet, and witha stem having a. longitudinal groove in its periphery slidably mountedin the tubular member, a spring-pressed anvil for the stem conned in thetubular member, the tubular member having a portion with slot and anintegral resilient instruck tongue extending into said groove forslidably retaining the stem in the tubular member, and a tubular casingof rubber tting around and jacketing the tubular member substantiallythroughout its length, forming a cover for the slot and forming aresilient grip for manipulating the tool, the casing being extendedaround said tongue.

MORRIS BROWN.

REFERENCES CITED The following references are of record in th le of thispatent:

UNITED STATES PATENTS Sweden Apr'. 23, 1940

